Grinder.



W. F. FRASER.

GRINDER.

APPHCATION HLEU MAR. 29 191:.

Patented May 28, 1918! 4 SHEETS SHEET I.

[TI/067L607? w. F. FRASER.

GHINDEH.

APPLICMIDN FILED MAR. 29. 19M.

4 SHEETS -SHEET 2,

Patented Ma -[TQ e W. F. FRASER.

GRINDER.

APPucATmu FILED mm. 29. 1911.

1,267,534. Patented May 28, 1918.

4 SHEETS--SHEET 3.

I711; 671130] T NN WWI/:5

W. F. FRASER.

GRINDER.

APPUCAHON mu) MAR. 29 1911.

4 SHEETS-SHELT 4.

7 LL; c: 1 1 4 (50 7 tree, or} Bos'rou,

' we r; raflsnie, or nosroiifnissncnusmrs,

ASSIGNOR TO WARREN F. FRASER M ASSACHUSETTS, A CORPORATION OFMASSACHUSETTS.

"' GRINDER.

Specification Letters ream. P t nted May 28, 1918,

Application filed March 29, 1917. Serial No. 158,415.

To u/ll whom it may concern:

Be itknown that I, WARREN F. FRASER, a subject of King George V ofEngland residin at Boston, in the county of Suii'olk B-and newand usefulImprovements in Grinders, of which the following is a specification.

This invention relates to an improvement in grinders and particularly tothe mecha- 10;.J1ism whereby the direction of movement of the'carriageis reversed. In mechanism of this character it is desirable and, infact, necessar to stop the motion of the carriage accurate y and quicklyat a certain point 15 when the direction of motionof the carriage isreversed. In order to secure this result the reversing mechanism must beoperated very quickly and with great accuracy. This necessitates aspring-actuated mechanism zogand it-is, therefore, essential that thereversing mechanism which is actuated by the spring or springs should belight as well as accurate, in order that said actuating spring orsprings may erform the work quickly.

The object o'i this invention is particularly, therefore, to

'provide an easily operatecl and accurate y working reversing mechampmIt is urther the object of the invention 80 to; provide such a mechanismwhich can be detached as aunit from the main portion of themachine, andwhich is so arranged that it can be easily inspected and adjusted.

To these ends the invention consists in the 85 combination andarrangement of parts set forth in the following specification andparticularly pointed out in the claiims thereof. .Referringto thedrawings: 1

Fi re 1 1s a front elevation of a grinding 40 machine embodying myinvention,

Fig. 2 is an enlarged elevation, partly broken away and shownin section,illustrat ing the reversing mechanism and the gearing forming a portionthereof.

Fig. 3 is a sectional elevation taken on line 3-3 of Fig. 1, thesamebeing broken r a F 1gt4= 1s a detail rear elevation, partly insedtiongas viewed from the rear of the mai thine or toithe left of Fi3,; illustrating the"- bevel gear reversing mec ani sm.

Fig. 5 is an enlarged sectional elevation of the lower portion of thereversing lever.

tate of Massachusetts, have invented Fig. 6 is a detail front elevation011- tne" I bell crank lever stops and the rock-shaft arm .56

in connection with which they operate; 1'

Like numerals refer to like parts through out the several views of thedrawin l In the drawings, 10 is the main ame of the machine, 11 is .thecarriage, 12. is the.

is rotated by any suitable means, such, for example, as a cone pulley(not shown inns the drawings). Said main driving shaftw has looselymounted thereon a pair of bevel gears 20, 21, said bevel gears beingrotatably Y mounted in bearings 22 on an auxiliary frame 23, saidauxiliary frame also embody 180 ing studs 24 and a front plate 25 whichis i fastened by screws 26 to the main frame 10: and is detachable fromsaid main frameas a unit, together with the reversing mecha nismhereinafter described which is mounted 85 on said auxiliary frame.

Between the bevel gears 20 and 21 a clutch. member 27 is slidablymounted upon the" main driving shaft 19. The opposite ends 1 of saidsliding clutch member are providedDO with teeth 28 and 29 adapted toengagecorrespondin teeth upon the gears 20 and 21, respective y. Saidclutch member 27 is rovided with an annular groove 30 in w ich arelocated blocks 31 which are connected to an arm 82 fastened to arock-shaft 33 which has bearings 34 and 35 in the auxiliary frame 23. .3

Said rock-shaft has a second arm 36 fas- 1 tened thereto and extendingtherefrom, thelower end of said arm 36 aving a stud 37 fast thereto andformin in downwardly The main driving shaft19 (Figs; 3 and 4f t efiect;a portion thereof. Said stud 3Fhasw it rectangular portion 38 midway ofits e cylindrical portion 89,

h and its outer end terminates in a 1.05

A lever 40 is pivotally mounted u on the sleeve bearing 35 which isfastene to the front late 25 of the auxiliary frame 23 and said rame ismounted to rock u on said sleeve 35 which forms a pivot there or. Thelever 40 is held upon the sleeve 35 by a screw 42 which hasscrew-threaded engagement with the sleeve 35. The upper end of saidlever 40 is provided with a handle 43.

A stud 44 is slidably mounted in the lever 40 and is held in position insaid lever by a spring-actuated pin 45 which engages an annular groove46 rovided in the periphery of the stud 44. he stud 44 forms, in eifect,a portion of the lever 40 and projects rearwardly therebeyond intoalinement with a pair of tappets 47, each consisting of a screw 48having screw-threaded engagement with a bracket 49 which is adjustablyfastened to thecarriage 11 by a bolt 50.

The lever 40 may be locked to the front plate 25 by means of aspring-actuated stud 51 or said stud may be held out of engagement withsaid plate by means of a crossin 52 (Fig. 3). The lever 40 is providedwit a hub 53 in which is slidably mounted a pair of oppositely disposedspring actuated contact members 54, 55. Each of these contact membershas a collar 56 fast thereto adapted to slide in a recess 57 provided inthe hub 53 anda spring 58 bears at one end against said collar 56 and atthe other end against an adjusting screw 59 having screw-threadedengagement with said hub, whereby the ad- 'acent ends of said contactmembers 54 and 5 are brought into contact with the cylin drical portion39 of the stud 37, as illus trated in Fig. 5.

In order that the reversing mechanism may be moved quickly and at acertain instant in the operation of the grinder, a pair of movable stops60 and 61 are provided. These steps consist of bell crank levers, thearms 62 of said levers being shorter than th arms 63. Said levers aremounted upon pins 64 which are fastened to the front plate 25 of tlregruxiliary frame 23. Said stops 60 and 61 ari-flactuated by means of asprin 65 and stop pins 60 and 61' are provide to limit the distance towhi'eh said stops may be moved by said spring. The outer ends of thearms 63 contact alternately with the op osite sides of the rectangularportion 38. he hub 53 of the lever 40 has two studs (Maud 67 fastthereto and projecting laterally therefrom into alincment with the arms62 of the stops 60 and 61, so that as the lever 40 is rocked upon itspivot alternately in opposite directions by the tappets 47 the pins 66and 67 will contact alternately with the arms'62 of the stops 60 and 61and will cause the reversing mechanism to be operated, as will be morefully hereinafterexplained.

A reciprocatory motion is imparted to the carriage 11 by the bevel gears20 and 21 which mesh into a bevel gear 68 which is fastened to acountershaft 69 rotatably mounted in a bearing 70 upon the auxiliaryframe 23. A pinion: 71 is fastened/to the shaft 69 and meshes into a at72 which has a pinion 73 fast thereto, sai gear and pinion bem rotatablymounted a on a studv74 whic is fastened to the aura iary frame 23. Thepinion 73 meshes into a gear 75 which is rotatably mounted upon a stud76 also fastened to the auxiliary frame 23, and said gear 75 meshes intoa rack 77 fast-to the under side of the carriage 11 (see Figs; 2 and 3).

When it is desired to operate: the carriage of the grinder by hand, itmay be done by means of a hand wheel 78 which is. connected to a shaft79 havin a pinion 80 fast thereto and meshing into t e gear '75, andwhen the carriage 11 is moved by hand to adjust: the

same to any desired position on the frame 10, the gearing whereb thecarri'a e isautomatical y operated is isconnected from the driving shaftby means of a handle 81 (Fig,

1) which operates a clutch 82 (Fig. 3) to disconnect the gear 72 fromthe pinion 73 in a manner well known to those skilled in this art, andthus the gear 75 will rotate the gear 73 which will rotate freely and"independently of the car 72 which leads, throu the train 0 gearinghereinbefore descri ed to the driving shaft. f

When it is desired to have the machine operated automatically to imparta reci 7 rocatory motion to the carriage, the 0111 h handle 81 isoperated to throw the clut'ch 82 into operation and thus again loci; thegear 72 to the pinion 73, whereby the driving train will be connected tothe gear 75.

In order that access to the stops 60 and 61 and the parts ad'acentthereto may be readily obtained, t e hub 53 is provided with a plate 83which is attached thereto by means of screws 84. p W The generaloperation of the machine hereinbefore specifically described is asfollows: Assuming the parts to be in the relative positions illustratedin Figs. 1 and v2 and the carriage 11 moving in t e direction of thearrow a, the screw 48 on'the right hand tappet 47 will eventually comeinto contact with the stud 44 forming apart of the lever 40 and willrock said ever upon its pivotal sleeve 35. Thiswill caiise the contactmember 54, which rests at "its right hand end against the cylindricalportion 39 of the stud 37, to be pushed into the recess 57 and thus tocompose" its plpring 58, while the contact member 55 w' travel away fromsaid pin, and during this'operation the outer end of the arm 63 ofthestop 6% rests against the right hand and (Fig.

the rectangular portion 38 of the stud 37. This step 61, therefore,holds the arm 36 stationary during this portion of theopera'tion,ijntilthe'pin 67 on said lever'el) contact$with1the arm '62of the sto 6i, andit cwill'bemotcdthat sa'id pin67 will contact withsaid arm at appoint much nearer the' described, the arm 36 will-berocked to-,

ward the right (Figs. 5 and 6) by the ex- :pansionof said spring and bythe contact member 54 until the outer end of the arm 63 of the stop 60slips in behind the left hand side of the rectangular portion 38 of thestud,37 and stops a ainst the stop pin 60', at the same time 100 ing t earm 36 in its new position. The stop 60 ill be moved, as hereinbeforedescribed, by the spring 65 and the outer end of the arm/63 of the stop61 will now bear against the under side of the rectangular portion 38 ina position similar to that formerly occupied by the Ste 60 in Fig. 6.

he rocking motion imparted to the arm.

36 will be transmitted by said arm to the roclqshaft 33 and to therocker arm 32,

thus causing the clutch member 27 to be moved out of contact with theteeth on the 85 hub of the bevel gear 21 and into en age- M10111; withthe teeth on the hub of the evel car 20, so that the bevel gear 21 willrun oose upon the shaft while the bevel ear 20 will become fast theretoand will drive the bevel gear 68 in the opposite direction to that inwhich it formerly rotated, thus reversing the motion of the train ofgearing .embodving the pinion 71, gear 72, pinion 73 and gear 75 and,through the rack 77, reversing the direction of motion of the car- Tiage11. Thus in time the tappet at the left of the lever 40 (Fig. 1) willengage the pin 44 and operate said lever in the opposite direction tothat hereinbefore described and will again actuate the reversingmechanism, bringing the parts back to the positions illustrated in thedrawings.

It will be evident that if it is desired to get at the stops and 61 orany of the 65 parts adjacent thereto, this can be readily done byremoving the plate 83, and if it is desired to repair. adjust or in anyway opcrate upon any of the different parts of the reversing mechanismhereinbefore described, 60 such. work can easily be accomplished byremoving the screws 26 from the plate 25, and the auxiliary frame,together with all the parts mounted thereon, can be readily slippedforward through the aperture in the 65 frame 10.

mor

shaft to said carriage and arm on op osite sides thereof,-.-aepa1fi,g

oppositely isposed movable stops-zadan, to alternately engage said armtot-196mm same against movement in onedirectlbilyfl lfii 85 a stationarysupport for saidstops sa lever being adapted to alternatelfi engage said'sto s and move them tea OWmWfli arm to e moved by one of said, sprig;actuated members, whereby said rock sha t; may be rocked alternately inoppositmdiigpc tlOHS. -iini a; US:

2. A grinder having, in 00' binatipnga reciprocatory carriage, tappetsion said barf riage, a main driving shaft, gearingeqn; 96 neeting saidmain driving shaft to isaid ear riage and mec anism adapted to.,reversegthe direction of r0 6 tion of said earing and/t N direction ofmotion of sai carrlage onraw prisin a rock-shaft, an arm thereon, le vera apted to be alternately engage said tappets and thereby rocked aternately in opposite directions, a pair of'ioppositely disposedspring-actuated contact, mend) mounted on said lever and engaging saiarm on opposite sides thereof, a pair of oppositely disposedspring-actuated bell crank levers adapted to alternately engage said armto lock the same against movement in one direction, a stationary supportfor said bell crank levers and means on said "lever adapted toalternately engage said bell crank levers and move them to allow saidarm to be moved by one of said springactuated contact members, wherebysald rock-shaft may be rocked alternately in opposite directions.

3. A grinder having, in combination, a reciprocatory carriage, a mainframe upon which said carriage is arranged to slide, tappets on saidcarriage, a main driving shaft, gearing connecting said main drivingmechanism adapted to reverse the direction of rotation of said gearingand the direction of motion of said carriage comprising a rock-shaft,

an arm thereon, a lever adapted to be alternately engaged by saidtappets and thereby rocked alternately in opposite directions, a pair ofoppositely disposed springactuated :1 apted to alternately engage saidarm to lock the. same against movement in one direction, a stationarysupport for said stops, said lever being adapted to alternately engagesaid stops and move them to allow said arm to be moved by one of saidspringof saidcarriage comprising actuated members, whereby saidrock-shaft may be rocked alternately in opposite directions, and anauxiliary frame fast to said main frame upon which said gearin andreversing mechanism are mounted.

4. A grinder having, in combination, a reciprocatory carriage, a mainframe upon which said carriage is arranged to slide, tap ets on saidcarriage, a main driving sha t,- gearin connecting said main drivingshaft to said carriage and mechanism adapted to reverse the direction ofrotation of said gearing and the direction of motion a rock-shaft, anarm thereon, a lever adapted to be alternately engaged by said tappetsand thereby rocked alternately in opposite directions, a

, pair of oppositely disposed spring-actuated contact me bers mounted onsaid lever and engaging said arm on opposite sides thereof, a air ofoppositely disposed movable steps a apted to alternately engage said armto lock the same against movement in one direction, a stationary supportfor said stops,, said lever being adapted. to alter nately engage saidstops and move them to allow said arm to be movedby one of saidspringactuated members, whereby said rock-shaft may be rockedalternately in op- POSitQ'diI'BOtIODSwAH auxiliary frame fast to saidmam frame upon which said gearing and reversingI mechanism are mounted,and means to loo said lever to said auxiliary frame.

- ing shaft 5 A grinder having, in combination, a reciprocatorycarriage, tapt ets on said carriage, a main driving sha a countershaft,a bevel gear fast to said countershaft,a air of bevel gears mounted onsaid main vand meshing into said countershaft bevel gear, a clutchslidable on said main driving shaft and adapted to alternately lock eachgear of said pair of bevel gears to said main driving shaft, gearsconnecting said counter-heft to said carriage, a rockhaft, an arm onsaid rock-shaft enga ing said clutch, whereby the same may e movedlongitudinally of said main driving shaft and alternately lock each gear0 said pair of bevel gears to said main driving she, a second arm onsaid rockshaft, a lever adapted to be alternately engaged by saidtappets and thereby, rocked alternately in op o ite directions, a pairof oppositely dispos spring-actuated contact members mounted on saidlever a d engaging said second arm on opposite sides thereof, a pair ofoppositely disposed movable stops adapted to alternately engage saidsecond arm to lock the same against moyement in one direction, astationary support for said stops and means on said lever adapted toalternately engage said stops and move them to allow said second arm tobe moved by one of said sprin -actuated members, whereb said rock-sha tmay be rocked alternately in opposite directions to shift said-clutchand thereby cause said carriage to be moved in op osite directions.

In testimony w ereof I have hereunto set my hand in presence of twosubscribing witnesses.

CHARLES F. Goonmo, SYDNEY E. TAFT-

